Table data acquired from Paul Borke's page at
http://local.wasp.uwa.edu.au/~pbourke/geometry/polygonise/

Asserts it's from Cory Gene Bloyde, who has provided "public domain" code
including the tables. http://www.siafoo.net/snippet/100

Grid definition matches SIGGRAPH 1987 p 164 (original presentation of technique)

file:/src/librt/primitives/nmg/nmg_tri_mc.c

